Potassium Phosphate, Tribasic → 4-Chloro-2-(2,6-dichloro-4-cyclopropylphenyl)thiazolo[5,4-c]pyridine

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-chloro-2-(2,6-dichloro-4-iodophenyl)thiazolo[5,4-c]pyridine (0.20 g, 0.45 mmol), cyclopropyl boronic acid (0.051 g, 0.59 mmol), Pd(OAc)2 (0.005 g, 0.023 mmol), P(Cy)3 (tricyclohexylphosphine) (0.013 g, 0.045 mmol) and potassium phosphate tribasic (0.336 g, 1.58 mmol) in toluene (4 mL) and water (0.2 mL) was degassed with a stream of argon and then heated at 100° C. for 18 hours. After cooling to room temperature, the crude reaction mixture was filtered through Celite® washing with EtOAc. The aqueous layer was extracted with EtOAc and the combined organic layers were washed with brine, then dried (MgSO4) and concentrated under reduced pressure. The resultant residue was combined with the crude reaction mixture (79 mg) obtained by reacting 4-chloro-2-(2,6-dichloro-4-iodophenyl)-thiazolo[5,4-c]pyridine (0.10 g, 0.23 mmol) under the same reaction conditions and purified by column chromatography on silica gel eluting with 0-30% Et2O in petroleum ether (40-60° C.) to afford the title compound as a yellow/orange solid (148 mg, 61%). LCMS (Method D): RT=4.69 min, m/z: 355 [M+H+].

Provenance & Evidence